Practice Quiz 2
For this exercise, please watch the first tutorial video before answering the questions. You are encouraged to use the video as much as you would like to answer the following questions. You will have an opportunity at the end to check your answers and retry as many times as you would like.
Earth Optics Video 2: Cross Polarized Light
All of the grains in the picture below are the same mineral in plane polarized light. Only knowing what we can see here, what can we say about this mineral?
The example in the video below is first seen in plane polarized light and then in cross polarized light. What can we say about this mineral?
This is the Michel-Levy Chart. Please use it for the following two questions.

Michel-Levy Chart: University of Liverpool. D Flinn G Newall
Assuming a thickness of 30 microns, what is the birefringence of this mineral?
Assuming a thickness of 30 microns, what is the birefringence of the mineral grain labeled A?
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